Power-driven bar-swaging machine



Nov. 5, 1946.

A. P. NEwALl.

POWER-DRIVEN BAR-SWAGING MACHINE Sheets-Sheet 1 Filed July 7,1 1944 Nov.5, 1946. A. P. NEWALL POWER-DRIVEN. BAR-SWAGING MACHINE 3 Sheets-Sheet 2Filed July 7, 1944 Nov, 5, 1946. A. P. NEWALL POWER-DRIVEN BARSWAGINGMACHINE Filed July '7, 1944 3 Sheets-Sheet 3 Patented Nov. 5, 1946aliauz UNITED STATES PATENT QFFICE POWER-DRIVEN BAR-SWAGHNG MACHENEArchibald Park Newall, Glasgow, Scotland Application July 7, 1944,Serial No. 543,875 In Great Britain July 17, 1943 (Cl. '7S-20) 3 Claims.l

This invention relates to improvements in power driven bar-swagingmachines of the rotary head type with controllable die members adaptedto impact the circumference of bar stock fed axially of the rotary head,whereby to swage said bar stock to reduced diameter.

The invention has for an object to provide an improved construction ofbar-feeding mechanism for a bar-swaging machine of the type referred to.

The invention provides in a machine of the type above set forth meansfor feeding the bar axially of the rotary head, in combination withmeans operative at preselected stations in the travel of the bar todetermine the activity or inactivity of the dies, and means for varyingthe rate of feed of the bar whereby the -bar may be moved rapidlybetween said stations and at a lower speed during the activity of thedies.

An embodiment of the invention will now be described with reference tothe accompanying drawings in which Fig. 1 is a side elevation, partlysectional, and broken to shorten the gure of a bar-swaging machine withbar-feeding and diecontrolling mechanism according to the invention;Fig. 2 is a face View of the swaging head with part removed forclearness; Fig. 3 is a sectional elevation; Fig. 4 an endview and Fig. 5a plan of a tractor carriage later to be described; Fig. 6 is a sideview to a larger scale ofpart of a swaged bar showing alternate swagedand unswaged portions.

The same reference characters denote corresponding parts in the severalviews.

Referring to Fig. 1 of the drawings, Il) indicates the body of a swagingmachine of the rotary head type, which, although in part of knownconstruction, will for the purpose of explanation be generally brieflydescribed. II denotes the swaging head housing a die carrier I2 locatedat one end of the usual hollow shaft I3 rotatably mounted in rollerbearings, one set of which is indicated at I4. Complemental swaging diesI5, I6 are mounted in the die-carrier I2 and adapted for intermittentsliding movement towards and away from each other under the impact ofhammer in spaced relationship' rollers I'I arranged around a case I8located in the head I I, see Fig. 2. I9', I9" are slide blocks eachfurnished with a roller 20', 20", respectively, adapted for rollingcontact with the hammer rollers I'I. Interposed between the slide blocksI9', I9" and the swaging dies I5, I6 are wedge members 2I', 2|, eachoperatively connected at one end to a further hollow shaft `22 disposedfor sliding movement in the hollow shaft I3.

The die controlling movement of the shaft 22 is elected by a hydraulicdevice consisting of a hydraulic ram including a cylinder 23 fitted witha piston 24 having a piston rod 25 operatively connected to one arm of abell-crank lever 26 pivotally of the bush 5I.

mounted at 2 in a bearing bracket 28 situated adjacent to the outer endof the machine I0. The other arm 26 of the lever 26 is connected, as bya pin-and-slot connection, to the outer end of the hollow shaft 22. Theram is controlled by a hydraulic reversing relay valve 28' unitary witha double-armed lever 29 to the opposite arms of which are connected twoendwise movable rods 33, 3I extending in parallelism with the track ofva bar-feeding carriage 32. The aforesaid track is formed by pairs ofchannel-iron members 33, 34 carried by stanchions 35 arranged at; spacedintervals according to the length of track required and braced togetherto form a unitary trackcarrying bridge. The endwise movable rods 30, 3lare further supported by two-armed levers 29', 29" pivotally mounted onthe respective adjacent stanchions 35. l

operatively associated with the hydraulic ram is a start-and-stop buttonlimit switch for a motor-driven pump unit 33 which supplies pressurefluid (oil) to the ram through the medium of a hydraulic reversing valve31 controlled by the relay Avalve 28. The supply of oil to the hydraulicram is controlled to vary the speed of movement of the lever 26 by meansof a throttle control valve 38 intercalated in the pipe line 39 to therelay valve 23. One side of the reversing valve 3l is piped at 46, lilrespectively, to one side of the relay valve 23 and to the cylinder 23below the piston 24. The other side of the reversing valve 3l is pipedat A2, 3, respectively, to the other side of the relay valve 2B and tothe cylinder 23 above the piston '2%. The reversing valve 3T is alsopiped at il to the sump of the pump unit 36,

and `the throttle control valve is piped at to the reversing valve 3l.The carriage 32 is provided with upper and lower sets of wheels 43, llto run on the tracks formed by the channel members 33, 3d. The carriage32 is provided with an adjustable bar-gripping chuck 43 rotatablymounted in ball-bearings its in the forward end of the carriage 32. Thejaw members 5s of the chuck are movable relatively to the chuck body 58by means of a push 5.! screwed into the body 8 and turnable by means ofa tommy-bar inserted in one of a set of holes 52 in the flange The chuckbody 48 is turnable by means vof a tommy-bar inserted in one of a set ofholes 53 in the ilange 48 of the chuck body. To' retardultra-freeturning movement of the chuck. there is provided a brakeconsisting of a metal block 54 with an arcuate face having a frictionlining 55 yieldingly held in contact with the periphery of the ange d3by means of springs 5% located in recesses 5l in the block 54 'and inholes 5S in the carriage 32, see Figs. 3 and 5. The holes 58 arenormally closed by removable screv threaded plugs 59, see Fig. 3.

The carriage 32 is provided on one side with a projecting block 60 inwhich is slidably mounted a striker 6| projecting above and below theblock 6D and adapted for movement transversely of the path of thecarriage 32 by engagement with adjustable stop members or cams 62, 63,on the movable control rods 3U, 3|, respectively, of the hydraulic relayvalve 28. The adjustable stop members or cams 62, 63 are mounted inspaced relation on the rods 30, 3| in positions which determine thelength of the swaged portions of the bar stock relatively to theunswaged portions.

For effecting traverse of the carriage 32, there is provided a rotarylead screw 64 which is engageable by a split nut member 35 mounted inthe floor of the carriage 32. The lead screw 63 is adapted to be drivenby a variable speed electric motor 66 through the medium ofspeedreduction gearing 61. 'Ihe housing of the motor and the reductiongear is carried on a stand 68 at the end of the bridge. The electricmotor 6B is speed-controlled by a control switch operated by a linkage|39 connected to the two-armed lever 23" of the endwise movable controlrods 3|, 32, see Fig. 1.

The mechanism is so arranged that the carriage 32 travels quickly whenthe swaging head is not operating on the bar stock and relatively slowlywhile the swaging head is operating on the bar stock.

The split-nut member 85 of the carriage 32 is adapted for restrictedvertical movement in a slideway 70. A stud 1| is secured in the nutmember 65 with freedom for turning movement therein and projects upwardsthrough a flanged bush 'l2 formed with a cam profile '13 on its upperface. The stud 'H is furnished with a handle i4 adapted to contact withthe cam prole 'i3 whereby turning movement of said handle will cause thenut member 65 to be moved up or down in the slideway 10 to release itfrom or put it into engagement with the lead-,screw 64. When the nutmember 65 is engaged with the lead screw 6, the handle 14 is engaged ina notch formed in the boss of the bush 12 whereby to prevent accidentaldisplacement of the nut member 65.

In the operation of the machine one end of the bar stock A to be swagedprojecting through the swaging machine IG is gripped by the jaws 5B ofthe chuck 48; the cams 62, 63 are set on the control rods 30, 3| inpredetermined positions to govern the length of the swaged parts of thebar stock relatively to the unswaged parts; and the machine is startedup.

As shown in Fig. 1, the parts are in the swaging position, oil from thepump unit 36 passing through the throttle control 38 via the pipe lines39 to the relay reversing valve 2B', and thence by the pipe lines 42 and43 and main reversing valve 31, is holding the piston 24 in its lowestposition thereby causing the lever 26 to retain the wedges in operativeposition against the dies. Rapid rotation of the die-head 2 causes thedies l5, I5 to be subjected to recurrent blows as the rollers 23" aresuccessively acted upon the hammer rollers l1".

The carriage 32 is drawn along the tracks by means of the lead screw 64until the striker 6| abuts against a cam stop 62, thus moving thecontrol rod 30 to actuate the reversing valve 28 to reverse the flow ofoil to the cylinder 23. Oil then passes to the underside of the piston24 via the pipe lines 4D, 4| and forces the piston 23 upwards whereby torock the lever 26 and to cause the wedge members 2|', 2|" to bewithdrawn to free the dies and permit the bar stock A to be drawnthrough said dies without being swaged. Further movement of the carriage32 causes the striker 6| to abut against a cam stop 63 on the othercontrol rod 3| to actuate the reversing valve 28 in the oppositedirection and again reverse the direction of ow of the oil, whereby thewedges 2|', 2| are caused to return to operative position to hold thedies together. This reversing movement continues alternately as thestriker 6| meets successive cams on the rods 30, 3|.

The mechanism is so arranged that the carriage 32 travels quickly whenthe swaging machine is not operating on the bar stock, and relativelyslowly while the machine is operating on the bar stock.

After each feeding traverse, the carriage 32 may be restored manually tostarting position by releasing the chuck, by causing the split nutmember S5 to disengage itself from the lead screw 64, and by pushing orpulling the carriage back along the track to starting position.

What is claimed is:

1. In a bar-swaging machine of the rotary head type, with die membersadapted to impact the circumference of bar-stock fed axially of saidhead whereby to swage the said bar-stock to reduced diameter, thecombination of bar-feeding mechanism including a carriage, means formoving said carriage parallel to the axis of said head, a chuck tted tosaid carriage and engageable with said bar-stock, wedge membersshiftable to render the dies operative or inoperative, an endwisemovable hollow shaft coaxial with said bar-stock and operativelyconnected to said wedge devices to shift said wedge devices fromdie-operative position to die-inoperative position, a hydraulic devicefor effecting axial movement of said hollov.T shaft, said hydraulicdevice consisting of a hydraulic ram including a cylinder, a pistonmovable in said cylinder, a piston rod fixed to said piston andoperatively connected with said hollow shaft, a pump unit having a pipeconnection to said hydraulic ram, a reversing valve intercalated in thepipe connection between said pump and said ram, to control the operationof said ram, a, double-armed lever unitary with said valve, a pair ofendwise movable rods extending in parallelism with the track of thecarriage and connected to the arms of said lever, and means on saidcarriage operable in the travel of said carriage to move said rodsalternately in opposite directions to reverse said valve.

2. In a bar-swaging machine, the combination claimed in claim l,including a carriage track extending parallel to the axis of the rotaryhead, a frame carrying said track, a lead screw journalled in saidframe, a variable speed motor for driving said lead screw, a split nutmember in said Ycarriage for engagementI with said lead screw, and aswitchv for controlling the speed of said motor, said switch operativelyconnected to said endwise movable rods.

3. In a bar-swaging machine, the combination claimed in claim 1,including adjustable cam stops on the endwise movable rods, and astriker on the carriage engageable withsaid cam stops.

ARCHIBALD PARK NEWALL.A

